Boston Police Commissioner Edward Davis speaks about the explosions during a press conference as Massachusetts Gov Deval Patrick, right, looks on, Monday, April 15, 2013, in Boston. Two explosions disrupted the Boston Marathon on Monday, causing at least two deaths and dozens of injuries and scattering crowds near the finish line, authorities said. (AP Photo/Bizuayehu Tesfaye)

Associated Press
Boston Police Commissioner Edward Davis speaks about the explosions during a press conference as Massachusetts Gov Deval Patrick, right, looks on, Monday, April 15, 2013, in Boston. Two explosions disrupted the Boston Marathon on Monday, causing at least two deaths and dozens of injuries and scattering crowds near the finish line, authorities said. (AP Photo/Bizuayehu Tesfaye)
Boston Police Commissioner Edward Davis speaks about the explosions during a press conference as Massachusetts Gov Deval Patrick, right, looks on, Monday, April 15, 2013, in Boston. Two explosions disrupted the Boston Marathon on Monday, causing at least two deaths and dozens of injuries and scattering crowds near the finish line, authorities said. (AP Photo/Bizuayehu Tesfaye)
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